Graphophone-mandrel.



No. 629,534. Patented July 25, I899. n. WOLF.

GRAPHUPHONE MANDREL.

(Application filed Oct. 31, 1898.) (,No Model.)

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. .1 UNITED STATES PATENT O FICE RUDOLF WOLF, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR OF ONE-HALF TO CHARLES KUTSCHER, OF SAME PLACE.

GRAPHOPHONE-MANDREL.

SPECIFICATION forming part of Letters Patent No. 629,534, dated July 25, 1899.

' Application filed October 31, 1898. Serial No. 695,007. (No model.)

To all whom it may concern.-

Be it known that I, RUDOLF WOLF, a subject of the Emperor of Germany, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented a new and useful Graphophone-Mandrel, of' which the following is a specification.

My invention relates in general to machines for recording and reproducing sonnds-as, for example, the machines known to the trade as graphophones and phonographsand novel graphophone or phonograph mandrel of which the following description, in connection with the accompanying drawings, is a specification, reference characters being used to designate the several parts.

Figure 1 is an elevation of my novel mandrel; Fig. 2, a section thereof, the shaft being in elevation; and Fig. 3 is an end elevation as seen from the right in Fig. 2.

-A denotes the shaft, which is simply a rod, and may or may not be turned down at the end, as at 1. I

B denotes the mandrel properthat is, the cylindrical carrier upon which the sound recording and reproducing cylinders are placed in use-the mandrels being ordinarily slightly tapering, as shown in the drawings.

2 denotes a sleeve which adheres tightly to the shaft; 3, a head formed integral with the mandrel and the sleeve, whereby said mandrel and sleeve are located concentrically,

and 4 denotes wings formed integral with the mandrel, sleeve, and head, whereby the mandrel is braced and strengthened and the mandrel and shaft are rigidly and permanently secured in their proper positions relatively to each other.

In practice I form the mandrel,sleeve, head, and wings and at the same time rigidly and permanently secure said parts to the shaft by, casting them in one piece and upon the shaft, the parts of the mold being suitably shaped to give the exact contour required to the exterior surface of the mandrel and head, and the pieces com prising the core being so shaped as to hold the shaft concentrically in the mold and to give the desired shape to the sleeve and wings when the molten metal is poured into the mold.

I have found in practice that by casting mandrel, sleeve, head, and wings upon a shaft secured concentrically in the mold I am en-' abled to produce a mandrel that will require no truing up, as it will run true in the condition in which it comes from the mold and in which the various operationsof hand-finishing heretofore found necessary may be wholly dispensed with. v

Having thus described my invention, I claim-- Amandrel of the character described comprising a cylinder-carrier, a sleeve, a head, and wings connecting the sleeve and carrier, all composed of integral, cast metal, and a shaft one end of which is located in said sleeve, and the latter being secured in place by casting thereon.

In testimony whereof I affix my signature in presence of two witnesses.

RUDOLF l/VOLF.

Witnesses:

A. M. WOOSTER, S. V. HELEY. 

